1 files changed, 59 insertions, 0 deletions
diff --git a/node_modules/gulp-json-transform/index.js b/node_modules/gulp-json-transform/index.js
new file mode 100644
index 000000000..a42f4239c
--- /dev/null
+++ b/node_modules/gulp-json-transform/index.js
@@ -0,0 +1,59 @@
+var Promise = require('promise');
+var through = require('through2');
+var gutil = require('gulp-util');
+var PluginError = gutil.PluginError;
+
+const PLUGIN_NAME = 'gulp-json-transform';
+
+function jsonPromiseParse(rawStr) {
+  return new Promise(function(resolve, reject) {
+    var json;
+    try {
+      json = JSON.parse(rawStr);
+    } catch (e) {
+      return reject(new Error('Invalid JSON: ' + e.message));
+    }
+    resolve(json);
+  });
+}
+
+module.exports = function(transformFn, jsonSpace) {
+  if (!transformFn) {
+    throw new PluginError(PLUGIN_NAME, 'Missing transform function!');
+  }
+
+  return through.obj(function(file, enc, cb) {
+    var self = this;
+
+    if (file.isStream()) {
+      return self.emit('error', new PluginError(PLUGIN_NAME, 'Streaming not supported'));
+    }
+
+    if (file.isBuffer()) {
+      var fileContent = file.contents.toString(enc);
+
+      jsonPromiseParse(fileContent)
+        .then(function(data){
+          return transformFn(data, {
+            path: file.path,
+            relative: file.relative,
+            base: file.base
+          });
+        })
+        .then(function(output) {
+          var isString = (typeof output === 'string');
+          file.contents = new Buffer(isString ? output : JSON.stringify(output, null, jsonSpace));
+          self.push(file);
+          cb();
+        })
+        .catch(function(e) {
+          gutil.log(PLUGIN_NAME + ':', gutil.colors.red(e.message));
+          self.emit('error', new PluginError(PLUGIN_NAME, e));
+          self.emit('end');
+        });
+
+    }
+
+  });
+
+};